The air/fuel sensor, located in the exhaust system, may be damaged by moisture in the exhaust resulting in illumination of the Check Engine Light. Replacing the damaged air/fuel sensor and updating the powertrain control module (PCM) software should correct this concern.Google+
Car Problem Reports
Honda Civic Moisture Damage to Air Fuel Sensor
Honda Civic Problem
Model Year Affected: 2006
Visitor, 2006 Honda Civic, 185,130 mi
Engine light came on. Honda service diagnosed as Air Fuel Sensor gone bad. Testing, part and service cost $413.00. Really only problem after all these miles.